[sysprof/wip/chergert/control-fd] libsysprof: check for valid GError

[Christian Hergert <chergert src gnome org>]

commit a973ded05ccd2f9fe547ffccd5b6a902cc7e3662
Author: Christian Hergert <chergert redhat com>
Date:   Tue Feb 11 15:10:54 2020 -0800

    libsysprof: check for valid GError

 src/libsysprof/sysprof-control-source.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/libsysprof/sysprof-control-source.c b/src/libsysprof/sysprof-control-source.c
index edf1696..603e45b 100644
--- a/src/libsysprof/sysprof-control-source.c
+++ b/src/libsysprof/sysprof-control-source.c
@@ -141,7 +141,8 @@ on_bus_closed_cb (GDBusConnection      *connection,
                   const GError         *error,
                   SysprofControlSource *self)
 {
-  g_printerr ("Bus connection closed: %s\n", error->message);
+  if (error != NULL)
+    g_warning ("Bus connection prematurely closed: %s\n", error->message);
 }
 
 static void